Ultra Beasts

Ultra Beasts are certain group of Legendary Pokémon that come from an alternate universe, Ultra Space. The Aether Foundation created "Type: Full" to exterminate the beasts, which failed, then naming Type: Null".

Alolan forms

Alolan forms are a brand new addition to the series. Alolan forms are Pokémon from previous generations that went through several changes due to the climate of Alola. These changes include the Pokémon's type, height, and weight. So far, they all only seem to be from Generation I.